Mr. George H. Lanchester, former chief engineer of Lanchester Cars,
1932 proposed the completely different arrangement shown to the right. His
aim was to avoid the engagedisengage procedure by using an allgeared,
constantly enmeshed, fullfledged differential. But to satisfy the specification
given in the Sung Shih many "misprints"
(e.g. number of gears, total number of teeth) have to be assumed.
Alternatively, deliberately wrong details may be assumed, intended to keep the design secret. Another problem would be accuracy: It is left as an exercise to the reader to calculate the directional deviation resulting from a mismatch of only one percent in the diameters of the road wheels. 
(click for details)

If, for instance, the lefthand roadwheel moves faster than the right, as on a westward turn, B will move while B_{1}, B_{2} will be almost stationary, and C will be turning while C_{1} will be almost at rest. Hence D, D_{1} will react to precisely the same extent but in the opposite direction. They will then stay put, though C, C_{1} will resume their mutually opposite regular motion until further relative change of the roadwheel velocities occurs.
Mr.Lanchester built a scale model of his design (using
wood and only a pen knife !) and demonstrated its functionality on many occasions
(so I've been told by contemporaries)

